CN101233665B - Contact-less chargeable battery and charging device, battery charging set, and charging control method thereof - Google Patents

Abstract

A contact-less chargeable battery includes a primary coil for generating a magnetic field by intermittently applied high frequency AC current, and a contact-less chargeable battery includes a second coil to which a high frequency AC current is intermittently induced by linkage of the magnetic field. The high frequency AC current induced in the secondary coil is rectified into DC current and applied to a battery cell through a constant- voltage/constant-current element. The microprocessor of the battery monitors voltages at both ends of the element and wirelessly transmits the monitoring result to the charging device while high frequency AC current is not induced in the secondary coil. The microprocessor of the charger adjusts power of the high frequency AC current applied to the primary coil according to the monitoring result to change a charging power transmitted to the battery. By repeatedly adjusting the charging power, an overvoltage state may be rapidly solved.

Description

Contactless rechargeable battery, charging device, battery charging pack, and charging control method thereof

technical field

The present invention relates to a non-contact rechargeable battery and a charging device utilizing the phenomenon of electromagnetic induction, and a charging control method thereof; Overvoltage is applied across the circuit part of the invention, which can also solve the overvoltage state through wireless feedback control, and relates to a non-contact charging device for charging such a battery, a battery charging pack including the above-mentioned elements, and a charging control method thereof.

Background technique

Personal portable devices such as cellular telephones and notebook computers are powered by rechargeable batteries. If the voltage of the battery falls below a predetermined level, the user of the personal portable device charges the battery using the charging device and then uses the portable device again.

Generally, the battery of a personal portable device has exposed contact terminals so that it can be electrically connected to a charging terminal prepared for a charging device. When charging the battery, the charging terminal of the charging device and the contact terminal of the battery are connected to each other, and they are kept electrically connected.

However, since the charging terminal and the contact terminal are exposed for mutual connection, they are easily contaminated with impurities, and are also easily worn due to friction between the two ends when the charging terminal and the contact terminal are connected. In addition, in the prior art, the charging terminal and the contact terminal are easily corroded by moisture, so that the connection state between the charging terminal and the contact terminal deteriorates. Also, if moisture enters the battery through tiny gaps in the contact terminals while the battery is in use, the battery is completely discharged due to a short circuit in its internal circuit, which causes a major problem.

In order to solve these problems, a non-contact charging technology has recently been proposed that can charge the battery of a personal portable device when the battery and charger are wirelessly coupled through the phenomenon of electromagnetic induction. Currently, this contactless charging technology is widely used in everyday products such as electric toothbrushes and electric shavers.

FIG. 1 is a schematic diagram showing a battery and a charger employing a conventional contactless charging method.

Referring to Fig. 1, the charger 10 includes: a high-frequency electric drive device 30 for receiving electric energy from a general AC power source 20 to output a high-frequency alternating current; and a primary coil 40 for providing a high-frequency alternating current from the high-frequency electric drive device 30 current to form a magnetic field M.

In addition, the battery 50 includes: a storage battery unit 60 charged with electric energy; a secondary coil 70 that induces a high-frequency alternating current according to passing through the magnetic field M generated in the primary coil 40; a rectifier 80 for converting the secondary high frequency alternating current induced in the primary coil 70 into direct current; and a constant voltage/constant current supplier 90 for applying the alternating current rectified in the rectifier 80 to the battery unit 60 .

Here, the constant voltage/constant current supplier 90 is a well-known circuit element widely used in battery charging equipment. The role of the constant voltage/constant current supply 90 is to supply current constantly to the battery cells 60 during the initial charging phase, then if the charging voltage of the battery cells 60 slowly increases and exceeds a certain standard level, the current supply is reduced but the voltage is maintained constant.

According to the charger 10 and the battery 50 using the contactless charging method in the prior art, the intensity of the high frequency alternating current induced in the secondary coil 70 is proportional to the intensity of the magnetic flux passing through the secondary coil 70 . In addition, the intensity of the magnetic flux passing through the secondary coil 70 changes according to the relative position to the primary coil 40 . That is, if the secondary coil 70 is positioned close to the primary coil 40 of the charger 10, the intensity of the magnetic flux passing through the secondary coil 70 increases, causing the intensity of the high-frequency alternating current induced by the secondary coil 70 to increase. Increase.

Meanwhile, the standard of the constant voltage/constant current supplier 90 , which is an essential element configured to the charging circuit module of the non-contact rechargeable battery 50 , is defined according to the intensity of the high frequency alternating current induced by the secondary coil 70 . However, as described above, the intensity of the alternating current induced by the secondary coil 70 varies according to the relative position between the primary coil 40 and the secondary coil 70 .

Therefore, if a small high-frequency alternating current is used to define the standard of the constant voltage/constant current supplier 90, if the battery 50 is in a position where a large high-frequency alternating current is induced, the battery 10 may be charged at a constant voltage. Overvoltage exceeding the standard is applied across the constant current supplier 90, thereby possibly causing damage to some parts.

Considering the above situation, the charger 10 and the battery 50 using the contactless charging method in the prior art generally adopt such a structure that the position between the two can be relatively fixed at the standard that defines the constant voltage/constant current supply 90 s position.

FIG. 2 is a perspective view illustrating a coupled state of the electric toothbrush 100 employing a conventional contactless charging method.

Referring to FIG. 2, the electric toothbrush 100 includes: a toothbrush body 110 having a battery 115 installed at a bottom end thereof; and a charger 120 for charging the battery 115 in a contactless method. The main groove 130 and the auxiliary groove 140 are prepared at the bottom of the toothbrush body 110, and the main protrusion 150 and the auxiliary protrusion 160 are respectively prepared on the top of the charger 120 in a shape matching the main groove 130 and the auxiliary groove 140. .

The toothbrush body 110 and the charger 120 are tightly fixed to each other by matching the grooves 130 , 140 and the protrusions 150 , 160 , so that the relative positions of the charger 120 and the battery 150 disposed on the toothbrush body 110 are closely fixed.

The standard of the constant voltage/constant current supply 170 configured on the battery 115 is defined under the assumption that the toothbrush body 110 and the charger 120 are closely coupled. Therefore, an overvoltage exceeding a standard is not applied across the constant voltage/constant current supplier 170, thereby preventing the constant voltage/constant current supplier 170 from being damaged due to an unexpected overvoltage.

However, as described above, the relative positions of the battery 115 and the charger 120 are strictly limited, so that inconvenience is caused to the user. That is to say, whenever the battery 115 disposed on the toothbrush body 110 is charged, the user needs to make repeated efforts to fix the toothbrush body 110 at a fixed position based on the charger 120 . Therefore, in order to bring the greatest convenience to users, a new alternative technology is required, which can overcome the limitation on the relative positions of the battery 115 and the charger 120 .

Contents of the invention

technical problem

The present invention has been devised in consideration of the above-mentioned problems, and therefore an object of the present invention is to provide a non-contact rechargeable battery, a charging device, and a battery charging pack including the above-mentioned components, which can prevent any damage to the internal battery circuit, and solve the problems in the following The non-contact charging method places restrictions on the relative position between the rechargeable battery and the charging device when charging the battery.

Another object of the present invention is to provide a battery charging control method capable of preventing any damage to an internal battery circuit and solving restrictions on relative positions between a rechargeable battery and a charging device when a contactless charging method is employed.

Technical solutions

To achieve the above object, the present invention provides a non-contact rechargeable battery, including a charging circuit module for receiving charging power from an external non-contact charging device through electromagnetic induction, and then charging the battery unit with electric energy.

Specifically, the charging circuit module includes: a high-frequency alternating current induction unit, which induces a high-frequency alternating current through a magnetic field generated from an external non-contact charging device; a rectifier, which receives the induced high-frequency alternating current, and converts the converting the induced high-frequency alternating current into a direct current; a constant voltage/constant current supplier receiving the direct current from the rectifier and supplying charging power to the storage battery unit in a constant voltage/constant current mode; and an overvoltage monitoring unit that monitors the voltage across the constant voltage/constant current supplier, and transmits a monitoring result to the external contactless charging device through wireless communication, thereby inducing a change in the strength of the magnetic field.

In order to achieve the above objects, the present invention provides a contactless charging device that transmits charging power to a contactless rechargeable battery through the phenomenon of electromagnetic induction. To this end, the charging device includes: a magnetic field generating unit that receives an alternating current and forms a magnetic field in an external space; a high-frequency power drive unit that applies a high-frequency alternating current to the magnetic field generating unit; and a charging power adjustment unit that Receive the monitoring result from the non-contact rechargeable battery through wireless communication, and control the high-frequency power drive unit to adjust the power of the high-frequency alternating current applied to the magnetic field generating unit, thereby adjusting the power sent to the battery charging power.

Preferably, the high-frequency electric drive unit intermittently applies high-frequency alternating current to the magnetic field generating unit. In addition, when the magnetic field is not generated by the magnetic field generating unit, the overvoltage monitoring unit of the battery wirelessly transmits the monitoring result to the charging power regulating unit.

Preferably, the monitoring result is a charging power adjustment request signal, a voltage difference between the two ends of the constant voltage/constant current supply, a voltage value between the two ends, or a code indicating that the voltage between the two ends is in an overvoltage state.

Preferably, the high-frequency alternating current induction unit is a coil, wherein the magnetic flux of the magnetic field generated from the external non-contact charging device passes through the coil, and the magnetic field generating unit is a coil with high-frequency alternating current applied to both ends .

Preferably, the overvoltage monitoring unit includes: a wireless sending unit, which transmits the monitoring result wirelessly through an antenna; first and second voltage detectors, which respectively detect the terminal voltage; a voltage comparator, which compares the first and second voltages detected by the first and second voltage detectors, and outputs a voltage comparison result; and a microprocessor, which reports to the The wireless sending unit outputs the monitoring result.

Preferably, the overvoltage monitoring unit further includes: a charging suspension detection unit that receives the high-frequency alternating current output from the high-frequency alternating current induction unit to detect a time point when the induction of the high-frequency alternating current ends , and then output the end time point to the microprocessor. In this case, the microprocessor outputs the monitoring result to the wireless sending unit after the end time point is input.

Preferably, the charging power adjustment unit includes: a wireless receiving unit that wirelessly receives the monitoring result through an antenna; and a microprocessor that receives the monitoring result from the wireless receiving unit and controls the high-frequency power The driving unit adjusts the power of the high-frequency alternating current applied to the magnetic field generating unit.

Preferably, the rechargeable battery further includes a constant voltage supplier for converting a general alternating current, which converts the general alternating current into a direct current, and then supplies a constant voltage current to the high frequency electric drive unit. And, the high-frequency electric drive unit includes: a pulse signal generator, which receives a pulse drive signal from the microprocessor and outputs a pulse signal; and an electric drive part, which receives the pulse signal to quickly switch from the constant A constant voltage current input by a voltage supply to generate a high frequency alternating current in a pulse pattern.

Preferably, the charging power adjusting unit adjusts the charging power by modulating pulse current width, pulse current frequency, pulse amplitude, or pulse number.

Preferably, the constant voltage supplier includes: an overvoltage filter, which receives a general alternating current and cuts off the overvoltage current; a rectifier, which rectifies the alternating current passing through the filter, so as to convert the alternating current into a direct current; and a constant voltage supply part receiving the converted direct current and outputting a constant voltage current.

According to another aspect of the present invention, there is also provided a control method for charging a non-contact rechargeable battery through electromagnetic induction using a non-contact charging device, the method includes the following steps: intermittently supplying A high-frequency alternating current is applied periodically, thereby intermittently generating a magnetic field in the external area; the magnetic flux of the generated magnetic field passes through the secondary coil arranged on the battery, thereby intermittently outputting an electromagnetically induced high-frequency alternating current; for the output high rectifying the high-frequency alternating current to convert the high-frequency alternating current into a direct current; applying the direct current to the battery unit through a constant voltage/constant current element, thereby charging the battery unit in a constant voltage/constant current mode; monitoring the voltage across the constant voltage/constant current element, and sending the monitoring result to the charging device through wireless communication when no high-frequency alternating current is induced in the secondary coil; and adjusting the applied voltage based on the sent monitoring result. The power of the high frequency alternating current in the primary coil.

Description of drawings

These and other features, aspects and advantages of preferred embodiments of the present invention will be fully described in the following detailed description with reference to the accompanying drawings. in:

1 is a schematic diagram illustrating a charging device and a battery using a conventional contactless charging method;

2 is a perspective view showing a coupled state of an electric toothbrush adopting a conventional non-contact charging method;

3 is a schematic block diagram illustrating a contactless rechargeable battery and a charging device according to a preferred embodiment of the present invention;

FIG. 4 is a detailed block diagram illustrating the contactless charging device in FIG. 3;

Fig. 5 is a detailed block diagram showing the contactless battery in Fig. 3;

6 is a graph showing intermittent output of charging power from a secondary coil of a contactless rechargeable battery; and

Fig. 7 shows the use state of the contactless rechargeable battery and the charging device according to the present invention.

Best Mode for Carrying Out the Invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms used in this specification and the appended claims should not be construed as being limited to the general and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present invention, The inventors are allowed to appropriately define these terms based on the principles of the present invention for better description. Accordingly, the description provided herein is only a best example for the purpose of illustration and is not intended to limit the scope of the invention, so it is to be understood that other modifications may be made thereto without departing from the spirit and scope of the invention. Substitutions and Modifications.

FIG. 3 is a schematic block diagram showing a contactless charging device C and a contactless rechargeable battery B according to a preferred embodiment of the present invention.

Referring to FIG. 3 , the non-contact charging device C of this embodiment includes: a primary coil 200 , a high-frequency electric drive unit 210 , a main antenna 220 , a wireless receiving unit 230 , a microprocessor 240 , and a power supply 260 .

The high-frequency power driving unit 210 applies a high-frequency alternating current of tens of KHz to the primary coil 200 through a fast switching operation to generate a magnetic field. For example, the high-frequency electric drive unit 210 applies a high-frequency alternating current of 80KHz to the primary coil 200 . If the primary coil 200 generates a magnetic field by a high-frequency alternating current, charging power is transmitted to the rechargeable battery B in a non-contact method through an electromagnetic induction phenomenon.

Preferably, the high-frequency electric drive unit 210 adopts a known SMPS (Switch Mode Power Supply), but is not limited thereto.

The wireless receiving unit 230 receives an adjustment request signal of charging power transmitted from the rechargeable battery B through the antenna 220 and then inputs the signal to the microprocessor 240 .

The adjustment request signal is sent when too much charging power is transmitted to the battery that may cause damage on the circuit portion that supplies the constant voltage/constant current. The adjustment request signal is modulated and sent from the rechargeable battery B, so the wireless receiving unit 230 demodulates the adjustment request signal and inputs it to the microprocessor 240 .

Preferably, the adjustment request signal is wirelessly transmitted using a carrier wave of a frequency band of 10 to 15 MHz. In addition, the wireless receiving unit 230 may be configured using a photocoupler. However, the present invention is not limited to such a carrier frequency band and these elements for configuring the wireless receiving unit 230 .

When the adjustment request signal is wirelessly transmitted from the rechargeable battery B, it is preferable not to apply high-frequency alternating current to the primary coil 200 . If the adjustment request signal is wirelessly transmitted when a magnetic field is generated in the primary coil 200 due to the application of a high-frequency alternating current in the frequency band of several tens of KHz, the adjustment request signal may be shielded due to the magnetic field, so that the adjustment cannot be accurately received by the wireless receiving unit 230. request signal.

Therefore, the high-frequency electric driving unit 210 has periodic pause times instead of continuously applying high-frequency alternating current to the primary coil 200 . For example, every 3 seconds after sending charging power to the rechargeable battery B, the high frequency power driving unit 210 does not apply high frequency AC current to the primary coil 200 for 50 ms. In this case, the adjustment request signal is wirelessly transmitted within 30 ms when the high-frequency alternating current is not applied to the primary coil 200 .

The microprocessor 240 controls all operations of the charging device C, specifically, if an adjustment request signal for charging power is received from the wireless receiving unit 230, the microprocessor 240 controls the high frequency power driving unit 210 to adjust the high voltage applied to the primary coil 200. Electricity with high frequency alternating current.

Preferably, the microprocessor 240 controls the high frequency power drive unit 210 to perform high frequency pulse width modulation, pulse frequency modulation, pulse number modulation, or pulse amplitude modulation, so as to adjust the power of the high frequency alternating current. Then, the level of charging power sent to the rechargeable battery B is adjusted to prevent any damage to the circuits within the rechargeable battery B.

The power supply 260 receives the general AC current 250 and then converts it into a DC current, and then supplies operating power to the high frequency power driving unit 210 and the microprocessor 240 .

The non-contact rechargeable battery B of this embodiment includes a charging circuit module and a storage battery unit 300 charged by the charging circuit module, wherein the charging circuit module B includes a secondary coil 270, a rectifier 280, a constant voltage/constant current supply 290, a micro A processor 310 , a wireless sending unit 320 , and an antenna 330 .

When a high-frequency alternating current is applied to the primary coil 200 provided in the charging device C, the secondary coil 270 generates a high-frequency alternating current through electromagnetic induction. At this time, the high-frequency alternating current induced in the secondary coil 270 has an intensity proportional to the magnetic flux passing through the secondary coil 270 .

The rectifier 280 smoothes the high-frequency AC current induced in the secondary coil 270 to convert it into a DC current.

The constant voltage/constant current supplier 290 applies the rectified DC current to the battery unit 300 according to the control of the microprocessor 310 to charge the battery unit 300 . At this time, the constant voltage/constant current supplier 290 charges the storage battery unit 300 in the constant current mode in the initial charging stage, but if the charging voltage exceeds a predetermined standard, the constant voltage/constant current supplier 290 charges the storage battery unit 300 in the constant voltage mode. 300 charge, which keeps the voltage constant instead of reducing the current.

The microprocessor 310 controls the constant voltage/constant current supplier 290 to charge the storage battery unit 300, monitors whether too much voltage is applied across the constant voltage/constant current supplier 290, and outputs charging if too much voltage is applied. The power adjustment request signal is sent to the wireless transmission unit 320 .

Preferably, the operation of monitoring the voltage across the constant voltage/constant current supplier 290 is performed in a manner of measuring the front-end voltage _Vpp and the rear-end voltage _Vch of the constant voltage/constant current supplier 290, and then checking the two voltages Whether the difference between exceeds the standard value.

The wireless transmitting unit 320 receives the charging power adjustment request signal output from the microprocessor 310 , and then modulates the adjustment request signal and wirelessly transmits it to the antenna 220 provided on the wireless receiving unit 230 of the charging device C through the antenna 330 . At this time, a carrier wave of 10 to 15 MHz is used, and the wireless transmitting unit 320 is implemented using a photocoupler, like the wireless receiving unit 230 .

If the adjustment request signal is sent to the charging device C, the power of the high frequency alternating current output through the high frequency power driving unit 210 is reduced according to the control of the microprocessor 240 . As a result, the power of the high-frequency alternating current induced in the secondary coil 270 by the electromagnetic induction phenomenon is reduced. Accordingly, the voltage applied across the constant voltage/constant current supplier 290 is also lowered. Preferably, the feedback control of the power of the high-frequency alternating current applied to the primary coil 200 is continued until excessive current is no longer applied across the constant voltage/constant current supplier 290 .

FIG. 4 is a block diagram illustrating a contactless charging device C according to an embodiment of the present invention in more detail.

Referring to FIG. 4, the power supply 260 includes: an overvoltage filter 260a for cutting off an overvoltage applied from the general-purpose AC power supply 250; a rectifier 260b for converting an AC current passing through the overvoltage filter 260a into a DC current; and a constant voltage The supplier 260c is used for receiving the rectified direct current and providing constant voltage direct current to the microprocessor 240 and the high-frequency electric drive unit 210 .

The high-frequency power drive unit 210 includes: a pulse signal generator 210a for receiving a pulse drive signal from the microprocessor 240 to generate a pulse signal; The constant voltage direct current input from the constant voltage supplier 260 c is switched to generate a high frequency alternating current, and then the high frequency alternating current is applied to the primary coil 200 .

FIG. 5 is a block diagram showing the contactless rechargeable battery B according to the present invention in more detail.

Referring to Fig. 5, the non-contact rechargeable battery B of the present embodiment also includes: a first voltage detector 350 and a second voltage detector 360, which are respectively arranged at the front end and the rear end of the constant voltage/constant current supply 290, to monitoring whether an overvoltage is applied across the constant voltage/constant current supply 290; and a voltage comparator 380 for comparing the first voltage V pp and the second voltage V _pp measured by the first and second voltage detectors 350, 360, respectively. The comparison result of V _ch is input to the microprocessor 310 .

The voltage comparison result is the difference between the first and second voltages, or the state of the voltages at both ends, which state indicates whether an overvoltage is applied. In the latter case, the voltage comparator 380 compares the reference voltage difference of the overvoltage condition with the difference between the first and second voltages.

Meanwhile, if it is determined that an overvoltage is applied after monitoring the voltage across the constant voltage/constant current supplier 290 , the microprocessor 310 wirelessly transmits an adjustment request signal of charging power to the charging device C using the wireless transmission unit 320 .

However, if the adjustment request signal is wirelessly propagated when charging power is transmitted from the primary coil 200 of the charging device C to the secondary coil 270 of the battery B, the adjustment request signal is shielded by the magnetic field generated from the primary coil 200 .

Therefore, in order to solve the above-mentioned problem, when the charging power is transmitted from the charging device C to the battery B, the transmission of the charging power is temporarily interrupted at a fixed cycle.

That is to say, as shown in FIG. 6, the charging zone Δt _A and the pause zone Δt _B are periodically repeated, wherein in the charging zone Δt _A , the high-frequency alternating current is induced in the secondary coil 270 by the phenomenon of electromagnetic induction for use For charging, the high-frequency AC current applied to the primary coil 200 is intentionally interrupted in the pause zone Δt _B to suspend charging. In addition, when the induction of the high-frequency alternating current in the secondary coil 270 is interrupted to suspend charging, an adjustment request signal for charging power is sent to the charging device C.

To this end, the battery B of this embodiment includes a charging suspension detection unit 390 for receiving the high-frequency alternating current induced in the secondary coil 270 and detecting the time point _ts when the charging zone ends (see FIG. 6 ).

The charging suspension detection unit 390 detects the end time point t _s of the charging zone (see FIG. 6 ), and then inputs it to the microprocessor 310 . Then, the microprocessor 310 wirelessly transmits an adjustment request signal for adjusting the charging power to the charging device C through the wireless transmission unit 320 when the charging power is not transmitted. Therefore, it is possible to prevent shielding of the adjustment request signal for charging power due to the magnetic field generated by the primary coil 200 .

If an adjustment request signal of the charging power is wirelessly transmitted to the charging device C, the power of the high-frequency alternating current applied to the primary coil 200 is controlled by the above-mentioned feedback control, so that the voltage across the constant voltage/constant current supplier 290 can be changed to controlled at an appropriate level.

Even if an overvoltage is applied across the constant voltage/constant current supplier 290, the non-contact charging device and the rechargeable battery according to the present invention described above reduce charging power in real time through feedback control, thereby being able to immediately resolve the overvoltage state.

Therefore, the non-contact charging device and the rechargeable battery of the present invention do not need to be fixed at a certain relative position as in the prior art, but the magnetic flux intensity passing through the secondary coil 270 is always maintained. In addition, since the charging device C is designed in a disc shape as shown in FIG. Charger and battery pack.

Hereinafter, a contactless charging control method according to the present invention will be described in detail with reference to FIGS. 4 and 5 .

First, in the case of the non-charging mode, the high-frequency power driving unit 210 of the charging device C applies high-frequency alternating current to the primary coil 200 at fixed time intervals according to the control of the microprocessor 240 . For example, a high-frequency alternating current of 80 KHz is applied for 50 ms at intervals of 1 second. Then, whenever a high-frequency alternating current is applied to the primary coil 200 , the primary coil 200 forms a magnetic field around the primary coil 200 .

For the purpose of charging the battery B, the user places the battery B on the charging device C. After the battery B is placed, if a high frequency alternating current is applied to the primary coil 200 of the charging device C for a predetermined time, a magnetic field is generated in the primary coil 200 and thus forms a magnetic flux passing through the secondary coil 270 of the battery B. Accordingly, a high frequency alternating current is induced in the secondary coil 270 for a predetermined time, and then, if the high frequency alternating current is not applied to the primary coil 200 , the induction of the high frequency alternating current is temporarily interrupted due to disappearance of the magnetic field.

Meanwhile, the charging suspension detection unit 390 detects a time point at which the induction of the high-frequency alternating current is temporarily interrupted, and then inputs it to the microprocessor 310 . In response, the microprocessor 310 outputs a response signal to the wireless sending unit 320 . Here, the response signal is a signal for notifying the microprocessor 240 of the charging device C that the secondary coil 270 disposed on the battery B is coupled to the magnetic field generated by the primary coil 200 of the charging device C. If the response signal is output to the wireless transmission unit 320 , the wireless transmission unit 320 modulates the response signal and then wirelessly transmits it to the charging device C through the antenna 330 .

If the response signal is wirelessly transmitted, the wireless receiving unit 230 of the charging device C demodulates the response signal and then inputs it to the microprocessor 240 . Then, the microprocessor 240 starts to transmit charging power to the battery B. That is, the microprocessor 240 controls the high frequency power driving unit 210 to repeat the operation of applying the high frequency alternating current to the primary coil 200 for a predetermined time interval and suspending the application of the high frequency alternating current for a predetermined time. For example, a high-frequency alternating current of 80 KHz is applied for 3 seconds, and then the application operation is suspended for 50 ms.

When a high-frequency alternating current is applied to the primary coil 200 , a high-frequency alternating current is induced in the secondary coil 270 of the battery due to an electromagnetic induction phenomenon. The above-mentioned time for continuously inducing the high-frequency alternating current is substantially equal to the time for continuously applying the high-frequency alternating current to the primary coil 200 .

The high frequency alternating current induced in the secondary coil 270 is converted into direct current by the rectifier 280 and then applied to the battery unit 300 via the constant voltage/constant current supplier 290 . Then, as the battery unit 300 is gradually charged, the voltage across the battery unit 300 rises up to a fully charged state.

The microprocessor 310 controls the constant voltage/constant current supplier 290 to charge the storage battery unit 300 in a constant current mode until the charging voltage of the storage battery unit increases to a certain level; and, if the voltage of the storage battery unit 300 increases beyond a predetermined level, then The battery unit 300 is also charged in a constant voltage mode.

Meanwhile, if the high frequency alternating current applied to the primary coil 200 is suspended, the induction of the high frequency alternating current in the secondary coil 270 is also temporarily interrupted, so that the charging process is temporarily stopped. Then, the charging suspension detection unit 390 detects a time point at which the induction of the high-frequency alternating current is interrupted, and then inputs it to the microprocessor 310 . This process is repeated every time the point of time to temporarily interrupt the induction of the high-frequency alternating current is reached.

Different from the charging process of the battery unit 300 described above, the microprocessor 310 monitors whether an overvoltage is applied across the constant voltage/constant current supplier 290 .

To this end, the voltage comparator 380 periodically receives the voltages measured by the first and second voltage detectors 350, 360 provided at the front and rear ends of the constant voltage/constant current supplier 290, respectively, to compare the voltages therebetween. , and then input the voltage comparison result to the microprocessor 310 . Here, the voltage comparison result is a voltage state signal representing the difference between two measured voltages or whether it is in an overvoltage state.

The microprocessor 310 receives the voltage comparison result from the voltage comparator 380 and then determines whether an overvoltage is applied across the constant voltage/constant current supplier 290 .

As a result, if it is determined that an overvoltage is applied across the constant voltage/constant current supplier 290, the microprocessor 310 refers to a time point at which the induction of the high-frequency alternating current is temporarily interrupted inputted from the charging suspension detection unit 390, thereby determining whether During a pause during which no high-frequency AC current is currently being applied to the primary coil.

As a result, the microprocessor 310 outputs an adjustment request signal of charging power to the wireless transmission unit 320 if it is determined to be during the suspension period. Then, the wireless transmission unit 320 modulates the adjustment request signal of the charging power, and then wirelessly transmits it to the charging device C through the antenna 330 .

In response thereto, the wireless receiving unit 230 provided in the charging device C receives and demodulates the charging power adjustment request signal through the antenna 220 , and then inputs it to the microprocessor 240 . Then, the microprocessor 240 controls the high-frequency power driving unit 210 to reduce the power of the high-frequency alternating current applied to the primary coil 200 below a predetermined level.

If the power of the high frequency alternating current applied to the primary coil 200 is reduced as described above, the power of the high frequency alternating current induced in the secondary coil 270 by the electromagnetic induction phenomenon is also reduced.

Meanwhile, the microprocessor 310 periodically repeatedly monitors the overvoltage state at both ends of the constant voltage/constant current supplier 290, unlike the feedback control on the power of the high frequency alternating current. As a result, if it is determined that the overvoltage state at both ends of the constant voltage/constant current supplier 290 has not been resolved by the first feedback control, the microprocessor 310 wirelessly transmits an adjustment request signal of the charging power to the charging device C again, thereby causing the charging device C to be applied to The power of the high frequency alternating current of the primary coil 200 is again reduced below a predetermined level. This process continues until no overvoltage is applied across the constant voltage/constant current supply 290 through feedback control.

The voltage difference across the constant voltage/constant current supplier 290 is maintained at an appropriate level through the above-mentioned feedback control, thereby preventing damage to the constant voltage/constant current supplier 290 due to overvoltage when charging the battery B in a non-contact method. damage.

In the above embodiment, in order to prevent overvoltage from being applied across the constant voltage/constant current supply 290 of the contactless rechargeable battery B, the microprocessor 310 of the battery B monitors the voltage measured across the constant voltage/constant current supply 290. to directly check whether it is in an overvoltage state. Furthermore, if in an overvoltage state, the microprocessor 310 of the battery B sends a charging power adjustment request signal to the microprocessor 240 of the charging device C through wireless communication. Then, the microprocessor 240 of the charging device C adjusts the power of the high-frequency alternating current applied to the primary coil 200 under the condition of receiving the charging power adjustment request signal.

However, another situation may also exist. Specifically, referring to FIGS. 4 and 5 , the microprocessor 310 of the battery B periodically monitors the voltage across the constant voltage/constant current supply 290 to obtain a voltage state.

Here, the voltage state is the voltage across the constant voltage/constant current supplier 290, or the difference between these two voltages. This voltage state can be input from the voltage comparator 380 , or obtained by calculating the measured voltages V _pp , V _ch input from the first and second voltage detectors 340 , 360 .

The microprocessor 340 of the battery B refers to the time point of the input signal of the charging suspension detection unit 390 every time the voltage state is obtained, and then transmits a constant voltage/constant current supply by wireless communication when a high-frequency alternating current is not induced to the secondary coil 270 The state of the voltage across the charger 290 is sent to the microprocessor 240 of the charging device C.

Then, whenever a voltage state is received, the microprocessor 240 of the charging device C checks whether the voltage state is an overvoltage state. This checking process is implemented by checking whether the difference in voltage across the constant voltage/constant current supplier 290 exceeds a predetermined reference value.

As a result, if the voltage state across the constant voltage/constant current supplier 290 corresponds to an overvoltage state, the high frequency power driving unit 210 is controlled to adjust the power of the high frequency alternating current applied to the primary coil 200, thereby adjusting the power sent to the battery B. recharging current.

If this charging current adjustment process is repeated as many times as necessary, even if an overvoltage is applied across the constant voltage/constant current supplier 290, the overvoltage condition can be resolved in a short time, preventing the constant voltage/constant current supplier from 290 were compromised.

The present invention has been described in detail. However, it should be understood that since various changes and modifications within the spirit and scope of the invention will be apparent to those skilled in the art from the detailed description herein, it is given by way of illustration only and is intended to represent the present invention. Detailed description and specific examples of the preferred embodiment of the invention.

Industrial Applicability

According to the present invention, even if an overvoltage is applied to both ends of the constant voltage/constant current supplier during the non-contact battery charging process, the charging power can be adjusted in real time through wireless feedback control, thereby preventing the Damage caused by overvoltage at both ends.

Accordingly, the restriction on the relative position between the charging device and the battery when adopting the contactless charging method is resolved, thereby maximizing user convenience.

Claims (24)

1. A non-contact rechargeable battery, comprising a charging circuit for charging battery cells with electric energy; the non-contact rechargeable battery includes: A high-frequency alternating current induction unit, which induces a high-frequency alternating current through a magnetic field generated from an external non-contact charging device; a rectifier that receives the induced high-frequency alternating current and converts the induced high-frequency alternating current into a direct current; a constant voltage/constant current supplier that receives the direct current from the rectifier and supplies charging power to the storage battery unit in a constant voltage/constant current mode; and an overvoltage monitoring unit that monitors the voltage across the constant voltage/constant current supplier, and transmits a monitoring result to the external contactless charging device through wireless communication, thereby inducing a change in the strength of the magnetic field. the 2. The non-contact rechargeable battery according to claim 1, wherein the high-frequency alternating current induction unit is a coil through which a magnetic flux of a magnetic field generated from the external non-contact charging device passes. the 3. The contactless rechargeable battery as claimed in claim 1, wherein the overvoltage monitoring unit comprises: A wireless sending unit, which transmits the monitoring result wirelessly through an antenna; first and second voltage detectors, which respectively detect voltages at the front end and rear end of the constant voltage/constant current supplier; a voltage comparator that compares the first and second voltages detected by the first and second voltage detectors, and outputs a voltage comparison result; and A microprocessor, which outputs a monitoring result to the wireless sending unit according to the voltage comparison result. the 4. The contactless rechargeable battery of claim 3, wherein the magnetic field generated by the contactless charging device is intermittently generated; Wherein the overvoltage monitoring unit further includes a charging suspension detection unit, configured to receive the high-frequency alternating current output from the high-frequency alternating current induction unit, to detect the time point when the induction of the high-frequency alternating current ends, and subsequently outputting the end time point to the microprocessor; and Wherein when no high-frequency alternating current is induced after the end time point is input, the monitoring result is sent to the external non-contact charging device through wireless communication. the 5. The non-contact rechargeable battery according to any one of claims 1 to 4, wherein the monitoring result is a charging power adjustment request signal. the 6. The non-contact rechargeable battery according to any one of claims 1 to 4, wherein the monitoring result is the voltage difference between the two ends of the constant voltage/constant current supply, the voltage value between the two ends, or used to represent the Code that the voltage at both ends is in an overvoltage state. the 7. A non-contact charging circuit module, electrically connected to the battery unit and charging the battery with electric energy in a non-contact method; the non-contact charging circuit module includes: A high-frequency alternating current induction unit, which induces a high-frequency alternating current through a magnetic field generated from an external non-contact charging device; a rectifier that receives the induced high-frequency alternating current and converts the induced high-frequency alternating current into a direct current; a constant voltage/constant current supplier that receives the direct current from the rectifier and supplies charging power to the storage battery in a constant voltage/constant current mode; and an overvoltage monitoring unit that monitors the voltage across the constant voltage/constant current supplier, and transmits a monitoring result to the external contactless charging device through wireless communication, thereby inducing a change in the strength of the magnetic field. the 8. The contactless charging circuit module as claimed in claim 7, wherein the high frequency alternating current induction unit is a coil through which the magnetic flux of the magnetic field generated from the external contactless charging device passes. the 9. The contactless charging circuit module according to claim 7, wherein the overvoltage monitoring unit comprises: A wireless sending unit, which transmits the monitoring result wirelessly through an antenna; first and second voltage detectors, which respectively detect voltages at the front end and rear end of the constant voltage/constant current supplier; a voltage comparator that compares the first and second voltages detected by the first and second voltage detectors, and outputs a voltage comparison result; and A microprocessor, which outputs a monitoring result to the wireless sending unit according to the voltage comparison result. the 10. The contactless charging circuit module according to claim 9, wherein the magnetic field generated by the contactless charging device is generated intermittently; Wherein the overvoltage monitoring unit further includes a charging suspension detection unit, configured to receive the high-frequency alternating current output from the high-frequency alternating current induction unit, to detect the time point when the induction of the high-frequency alternating current ends, and subsequently outputting the end time point to the microprocessor; and Wherein when no high-frequency alternating current is induced after the end time point is input, the monitoring result is sent to the external non-contact charging device through wireless communication. 11. The contactless charging circuit module according to any one of claims 7 to 10, wherein the monitoring result is a charging power adjustment request signal. the 12. The contactless charging circuit module according to any one of claims 7 to 10, wherein the monitoring result is the voltage difference between the front end and the rear end of the constant voltage/constant current supply, and the voltage value at the front end and the rear end , or the code used to indicate that the voltage at both ends is in an overvoltage state. the 13. A non-contact charging device that transmits charging power to a non-contact rechargeable battery through an electromagnetic induction phenomenon; the non-contact rechargeable battery has a constant voltage/constant current supplier capable of charging in a constant voltage/constant current mode, and Wirelessly sending the voltage monitoring results at both ends of the constant voltage/constant current supplier; the contactless charging device includes: A magnetic field generating unit that receives an alternating current and forms a magnetic field in an external space; a high-frequency electric drive unit that applies a high-frequency alternating current to the magnetic field generating unit; and a charging power adjustment unit that receives the monitoring result from the non-contact rechargeable battery through wireless communication, and controls the high frequency power driving unit to adjust the power of the high frequency alternating current applied to the magnetic field generating unit, thereby adjusting Charging power sent to the battery. the 14. The non-contact charging device according to claim 13, wherein the magnetic field generating unit is a coil to which a high-frequency alternating current is applied to both ends. the 15. The contactless charging device according to claim 13, wherein the charging power adjustment unit comprises: a wireless receiving unit, which wirelessly receives the monitoring result through an antenna; and a microprocessor, which receives the monitoring result from the wireless receiving unit, and controls the high-frequency power driving unit to adjust the power of the high-frequency alternating current applied to the magnetic field generating unit. the 16. The contactless rechargeable battery as claimed in claim 15, further comprising a constant voltage supply for converting a universal alternating current, which converts the universal alternating current into a direct current, and subsequently drives the high frequency electric current to the The unit supplies a constant voltage current; Wherein the high-frequency electric drive unit includes: a pulse signal generator, which receives a pulse driving signal from the microprocessor and outputs a pulse signal; and An electric driving part receives the pulse signal to switch the constant voltage current input from the constant voltage supply, so as to generate a high frequency alternating current in a pulse pattern. the 17. The contactless charging device according to claim 16, wherein the charging power adjustment unit adjusts the charging power by modulating pulse current width, pulse current frequency, pulse amplitude, or pulse number. 18. The contactless charging device according to claim 16, wherein the constant voltage supply comprises: an overvoltage filter, which receives the general alternating current and cuts off the overvoltage current; a rectifier that rectifies an alternating current passing through the overvoltage filter to convert the alternating current into a direct current; and The constant voltage supply part receives the converted direct current and outputs a constant voltage current. 19. The contactless charging device according to claim 13, wherein the high-frequency electric drive unit intermittently applies a high-frequency alternating current to the magnetic field generating unit; and Wherein, when no high-frequency alternating current is applied to the magnetic field generating unit, the charging power regulating unit receives the monitoring result. 20. The non-contact charging device according to any one of claims 13 to 19, wherein the monitoring result is a voltage difference at both ends of the constant voltage/constant current supply, a voltage value at both ends, used to represent the two The code that the voltage at the terminal is in an overvoltage state, or the charging power adjustment request signal. 21. A battery charging pack comprising a contactless rechargeable battery and a contactless charging device; Wherein said batteries include: A high-frequency alternating current induction unit, which induces high-frequency alternating current through a magnetic field intermittently generated from an external non-contact charging device; a rectifier that receives the induced high-frequency alternating current and converts the induced high-frequency alternating current into a direct current; a constant voltage/constant current supplier that receives the direct current from the rectifier and supplies charging power to the storage battery unit in a constant voltage/constant current mode; and An overvoltage monitoring unit, which monitors the voltage at both ends of the constant voltage/constant current supplier, and sends a monitoring result to the external contactless charging device through wireless communication when no high-frequency alternating current is induced; The charging equipment mentioned therein includes: A magnetic field generating unit that receives an alternating current and forms a magnetic field in an external space; a high-frequency electric drive unit that intermittently applies a high-frequency alternating current to the magnetic field generating unit; and a charging power adjustment unit that receives the monitoring result through wireless communication when high-frequency alternating current is not applied to the magnetic field generation unit, and controls the high-frequency power drive unit to adjust the high-frequency power applied to the magnetic field generation unit AC current power, thereby regulating the charging power sent to the battery. the 22. The battery charging pack as claimed in claim 21 , wherein the monitoring result is a voltage difference between two ends of the constant voltage/constant current supply, a voltage value at both ends, and an overvoltage for indicating that the voltage at both ends is overvoltage. A code of the state, or a charging power adjustment request signal. the 23. A control method for charging a non-contact rechargeable battery through electromagnetic induction using a non-contact charging device, the method comprising: (a) intermittently applying a high-frequency alternating current to a primary coil provided on said charging device, thereby intermittently generating a magnetic field in an external area; (b) The magnetic flux of the generated magnetic field passes through the secondary coil arranged on the battery, thereby intermittently outputting electromagnetically induced high-frequency alternating current; (c) rectifying the output high-frequency alternating current to convert the high-frequency alternating current into direct current; (d) applying the direct current to the storage battery unit through a constant voltage/constant current supplier, thereby charging the storage battery unit in a constant voltage/constant current mode; (e) monitoring the voltage across the constant voltage/constant current supplier, and sending the monitoring result to the charging device through wireless communication when no high-frequency alternating current is induced in the secondary coil; and (f) adjusting the power of the high-frequency alternating current applied to the primary coil based on the transmitted monitoring result. 24. The method according to claim 23, wherein the monitoring result is a voltage difference at both ends of the constant voltage/constant current supply, a voltage value at both ends, a code indicating that the voltage at both ends is in an overvoltage state, or a charging power adjustment request signal. the

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